On kinematics of gas clouds in the broad-line region of active galactic nuclei and quasars

Zlatan Tsvetanov, S. A. Zhekov

Research output: Contribution to journalArticle


The kinematics of gas clouds in broad-line region of active galactic nuclei and quasars is considered. The motion of the clouds is governed by three forces - gravitational influence from the central supermassive body, radiational pressure from the continuum radiation, and resistance of the intercloud medium. Clouds moves radial but only outward motion gives a velocity field, which is in accordance with the observational data. The profiles of the permited lines are obtained in some simplify assumptions for the emissive capacity of the gas in clouds, and are in good agreement with the observational data. In the framework of the model under consideration there is a possibility to estimate some physical parameters of the nuclei such as mass of the central body and density of the intercloud medium.

Original languageEnglish
Pages (from-to)345-348
Number of pages4
JournalAdvances in Space Research
Issue number10-12
Publication statusPublished - 1984
Externally publishedYes



  • Active galactic nuclei
  • profiles of the lines
  • quasars
  • Seyfert galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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